Journal
JOURNAL OF FLUID MECHANICS
Volume 933, Issue -, Pages -Publisher
CAMBRIDGE UNIV PRESS
DOI: 10.1017/jfm.2021.1069
Keywords
aerosols; atomization; absolute; convective instability; shear layers
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Funding
- Office of Naval Research (ONR) as part of the Multidisciplinary University Research Initiatives (MURI) Program [N00014-16-1-2617]
- IDEX UGA 'International Strategic Partnerships' program
- GENCI-CINES [A0072A00611]
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This study fills the gap in simulating shear instability under experimental conditions and achieves consistent results through convergence research using multiple methods. Additionally, the study explores the effects of confinement on flow stability and instability transition.
The shear instability occurring at the interface between a slow water layer and a fast air stream is a complex phenomenon driven by momentum and viscosity differences across the interface, velocity gradients as well as by injector geometries. Simulating such an instability under experimental conditions is numerically challenging and few studies exist in the literature. This work aims at filling a part of this gap by presenting a study of the convergence between two-dimensional simulations, linear theory and experiments, in regimes where the instability is triggered by the confinement, i.e. finite thicknesses of gas and liquid streams. It is found that very good agreement between the three approaches is obtained. Moreover, using simulations and linear theory, we explore in detail the effects of confinement on the stability of the flow and on the transition between absolute and convective instability regimes, which is shown to depend on the length scale of the confinement as well as on the dynamic pressure ratio. In the absolute regime under study, the interfacial wave frequency is found to be inversely proportional to the smallest injector size (liquid or gas).
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